Question:
An infinitely long rod lies along the axis of a concave mirror of focal length . The near end of the rod is a fa distance $u > f$ from the mirror. Its image will have a length
An infinitely long rod lies along the axis of a concave mirror of focal length . The near end of the rod is a fa distance $u > f$ from the mirror. Its image will have a length
Updated On: Jul 6, 2022
- $\frac{f^2}{u-f}$
- $\frac{f^2}{u+f}$
- $\frac{uf}{u-f}$
- $\frac{uf}{u+f}$
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The Correct Option is A
Solution and Explanation
Answer (a) $\frac{f^2}{u-f}$
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Notes on Spherical Mirrors
Concepts Used:
Spherical Mirrors
A spherical mirror is a mirror which has been cut out of a spherical surface.
There are two kinds of spherical mirrors:
- Convex Mirror
- Concave Mirror
Concave Mirror
Concave mirrors are also called converging mirrors, because in these types of mirrors, light rays converge at a point after impact and reflect back from the reflective surface of the mirror.
Convex Mirror
The convex mirror has a reflective surface that is curved outward. Regardless of the distance between the subject and the mirrors, these mirrors are "always" virtual, upright and reduced.